Hajo Meyer (born in 1924) is a German-Dutch physicist and Jewish political activist.

Born in Bielefeld, in 1938 Meyer fled from Nazi Germany to the Netherlands alone, without his parents. He went into hiding in 1943, but was arrested after a year and spent ten months in Auschwitz. His parents, who were deported from Germany, did not survive.

After the war, Meyer returned to the Netherlands, and studied theoretical physics. He started working for Philips and eventually became director of the Philips Physics Laboratory (NatLab). After his retirement he took courses in England and worked as a builder of new violins and violas.

In recent years Meyer has been politically active, including as director of A Different Jewish Voice. He also wrote the book Het einde van het Jodendom (The End of Judaism) in 2003, which accuses Israel of abusing the Holocaust to justify crimes against the Palestinians. He is a member of the International Jewish Anti-Zionist Network. He participated in the 2011 “Never Again – For Anyone” tour. Meyer also claimed that Zionism predates fascism, that Zionists and fascists had a history of cooperation, and that Israel wants to create anti-Semitism in the world to encourage more Jews to migrate to Israel. He has spoken in favor of Boycott, Divestment and Sanctions against Israel